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Thread: Seeking doc for adding a hard drive as multiboot system

  1. #11
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    Re: Seeking doc for adding a hard drive as multiboot system

    Are you using a 4GB flash drive for Windows?
    Windows .wim file is now over 4GB, so Windows needs 8GB flash drive as minimum.
    And you have to split .wim file to have it fit in FAT32 formatted partition as 4GB is max for FAT32.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  2. #12
    Join Date
    Apr 2006
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    Re: Seeking doc for adding a hard drive as multiboot system

    Quote Originally Posted by oldfred View Post
    Are you using a 4GB flash drive for Windows?
    Windows .wim file is now over 4GB, so Windows needs 8GB flash drive as minimum.
    Yes, OK I'll burn a new USB boot stick with size >8GB, or using a SanDisk card

    And you have to split .wim file to have it fit in FAT32 formatted partition as 4GB is max for FAT32.
    Could you please explain in more detail. Thanks

  3. #13
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    Re: Seeking doc for adding a hard drive as multiboot system

    Use the Windows installer tool as that splits the .wim file.
    Most instructions on Internet for for older verisons of Windows where .wim file was less than 4GB and fit on FAT32 formatted partition.
    And to boot in UEFI mode, .efi boot files have to be on FAT32 formatted partition for UEFI to read it.

    For Windows ISO with .wim > 4GB
    https://ubuntuforums.org/showthread.php?t=2444665
    https://github.com/ValdikSS/windows2usb

    Someone posted this, but I do not know.
    Latest Windows made .wim file smaller so extraction works again, depending on version.
    UEFI only uses FAT32 which has a size limit on one file of 4GB, but Windows wim is now too large, extracted into a NTFS partition and only boot files in FAT32.
    https://techbit.ca/2019/02/creating-...e-using-linux/
    https://itsfoss.com/bootable-windows-usb-linux/
    https://help.ubuntu.com/community/In...-for-big-files
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

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